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A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. [2] The images may represent electrical waveforms on an oscilloscope , a frame of video on an analog television set (TV), digital raster graphics on a computer monitor , or ...
As of June 30, nearly half a million 401(k) accounts (497,000) had balances of $1 million or more, up 2.5% from the prior quarter. The average balance hit $1,595,200, up from $1,581,000 at the end ...
Four weeks before he presented his completed theory of total internal reflection and the rhomb, Fresnel submitted a memoir [30] in which he introduced the needed terms linear polarization, circular polarization, and elliptical polarization, [31] and in which he explained optical rotation as a species of birefringence: linearly-polarized light ...
In France, there is an ongoing social, political, and legal debate concerning the wearing of the hijab and other forms of Islamic coverings in public. The cultural framework of the controversy can be traced to France's history of colonization in North Africa, [1] but escalated into a significant public debate in 1989 when three girls were suspended from school for refusing to remove their ...
3 January: A free online index with metadata about over 200 million scientific documents is launched, OpenAlex. [1]The graphs show one visualization of recent developments of science overall based on this data (fewer papers may not be associated with decreasing success, priority, impact or activity).
Bribery and disinterest occasionally permitted more leeway, as when the Portuguese began trading at Guangzhou (1517), Shuangyu ("Liampo"), and Quanzhou ("Chincheu"), [30] but crackdowns also occurred, as with the expulsion of the Portuguese in the 1520s, on the islands off Ningbo and Zhangzhou in 1547, or at Yuegang in 1549. [31]
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